docs: def subpnt(method, target, et, fixref, abcorr, obsrvr):
      """
      Compute the rectangular coordinates of the sub-observer point on
      a target body at a specified epoch, optionally corrected for
      light time and stellar aberration.
  
      This routine supersedes :func:`subpt`.
  
      http://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/cspice/subpnt_c.html
  
      :param method: Computation method.
      :type method: str
      :param target: Name of target body.
      :type target: str
      :param et: Epoch in ephemeris seconds past J2000 TDB.
      :type et: float
      :param fixref: Body-fixed, body-centered target body frame.
      :type fixref: str
      :param abcorr: Aberration correction.
      :type abcorr: str
      :param obsrvr: Name of observing body.
      :type obsrvr: str
      :return:
              Sub-observer point on the target body,
              Sub-observer point epoch,
              Vector from observer to sub-observer point.
      :rtype: tuple
      """
      method = stypes.stringToCharP(method)
      target = stypes.stringToCharP(target)
      et = ctypes.c_double(et)
      fixref = stypes.stringToCharP(fixref)
      abcorr = stypes.stringToCharP(abcorr)
      obsrvr = stypes.stringToCharP(obsrvr)
      spoint = stypes.emptyDoubleVector(3)
      trgepc = ctypes.c_double(0)
      srfvec = stypes.emptyDoubleVector(3)
      libspice.subpnt_c(method, target, et, fixref, abcorr, obsrvr, spoint,
                        ctypes.byref(trgepc), srfvec)
      return stypes.cVectorToPython(spoint), trgepc.value, stypes.cVectorToPython(
              srfvec)